In the code below, const int f(); decltype(f()) i = 0; `i` has type `int` (not `const int`) in C++11. This is because `f()` is a prvalue of a non-class type (i.e. `const int`) and so its cv qualifiers are ignored. C++0x drafts (before FDIS) had a special rule for function calls in decltype: if e is a function call or an invocation of an overloaded operator (parentheses around e are ignored), decltype(e) is the return type of the statically chosen function; but this was removed in FDIS. Clang-3.1 (which will be clang-3.1) and gcc-4.7 seem to have implemented this change, and this change breaks the test case (libs/utility/test/result_of_test.cpp) on those compilers in a C++11 mode. The following are the errors messages: [1] result_of_test.cpp:210:3: error: static assertion failed: (is_same<result_of<const result_of_member_function_template(double)>::type, const double>::value) [2] result_of_test.cpp:211:3: error: static assertion failed: (is_same<result_of<volatile result_of_member_function_template(double)>::type, volatile double>::value) [3] result_of_test.cpp:212:3: error: static assertion failed: (is_same<result_of<const volatile result_of_member_function_template(double)>::type, const volatile double>::value) [4] result_of_test.cpp:239:3: error: static assertion failed: (is_same<result_of<const volatile no_result_type_or_result_of(void)>::type, const unsigned short>::value) [5] result_of_test.cpp:244:3: error: static assertion failed: (is_same<result_of<const volatile no_result_type_or_result_of_template<void>(void)>::type, const unsigned short>::value) Regards, Michel